1886-1939

Russian-born Polish mathematician who published numerous papers on his theories of logic and the foundations of mathematics. Leshniewski attended several universities before earning a doctorate in 1912 at the University of Lwów (now Lviv) in Poland. He held teaching posts in Moscow and Warsaw, where he headed the department of the philosophy of mathematics. After his death, one of his former students (Tarski) reconstructed his unpublished work, which was destroyed in World War II.